Azimuthal Emission Patterns of K⁺ and of K^- Mesons in Ni + Ni Collisions near the Strangeness Production Threshold

2014/03/31 by V. Zinyuk, T. I. Kang, Y. Leifels +62 · 1 citation
Physics and Astronomy · #nucl-ex

paper · pdf · doi:10.1103/physrevc.90.025210

arxiv created 2014/07/04 · arxiv updated 2014/09/16

Abstract

Azimuthal emission patterns of K^± mesons have been measured in Ni + Ni collisions with the FOPI spectrometer at a beam kinetic energy of 1.91 A GeV. The transverse momentum p_T integrated directed and elliptic flow of K⁺ and K^- mesons as well as the centrality dependence of p_T - differential directed flow of K⁺ mesons are compared to the predictions of HSD and IQMD transport models. The data exhibits different propagation patterns of K⁺ and K^- mesons in the compressed and heated nuclear medium and favor the existence of a kaon-nucleon in-medium potential, repulsive for K⁺ mesons and attractive for K^- mesons.

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